Question

What is the ratio of hydrogen atoms present in heptyne to that in butene?

• A. $\frac{3}{2}$
• B. $\frac{7}{4}$
• C. $\frac{5}{2}$
• D. $\frac{6}{5}$

Answer 1

The correct option is A

$\frac{3}{2}$

Heptyne is an Alkyne with general formula ${\text{C}}_{\text{n}}{\text{H}}_{\text{2n-2}}$. "Hept" is the suffix given to 7- carbon chain.

Putting n=7 in the general formula,

We get the number of hydrogen atoms = $2\times 7-2=14-2=12$

So, the number of hydrogen atoms in heptyne is 12.

Butene is an alkene with a general formula as ${\text{C}}_{\text{n}}{\text{H}}_{\text{2n}}$. "But" is the root word for alkene with 4 carbons.

Substituting n=4 in the general formula.

We get the number of hydrogen atoms = $2\times 4=8$

So, the number of hydrogen atoms in butene is 8.

The ratio of number of hydrogen atoms in heptyne to that in butene = $\frac{12}{8}=\frac{3}{2}$